int extract_file(HWND hwnd)
{
	int l=0;
	char s[1024],*p;
	FILE *f=fopen("in.txt","r");
	if(!f)
	{
		return 0;
	}
	while(fgets(s,sizeof(s),f))
	{
	  p=strtok(s,":");
	  p=strtok(NULL,":\n");
	  if(p==NULL)
	  strcpy(mat[l],"");
	  else
	  strcpy(mat[l],p);
	  l++;
	}
	fclose(f);
	return 1;
}